Printing-ink.



20 after described and'particularly pointed out UNITED TATES MARION E. MoMASTER, OF QUINCY, ILLINOIS.

PRINTING-INK.

Specification of Letters Patent.

Patented J an. 21 1908 Application filed May 101 1906. Serial No- 316.191-

' Specification.

This invention relates to printing ink, and

has for its princi al object to provide a printing ink Whic -will not print back, that is to say, an impression will not be formed by the engagement of a' freshl printed sheet with anothersheet with whic it may engage.

A furtherobject of the invention is to pro vide a printing ink which may be made at a comparatively small cost and employed to advantage on re, idly running presses.

With these an other objects 1n view, the

invention consists in the printing ink hereinin the appended claims. In carrying out the invention, any ordinary printing ink is used as a basis, and with this ink is mixed a quantity of milk, preferably skim milk, theink being mixed directly with the milk or in some cases, es ecial-ly where the ink is not to be used for a ong period of time an antiseptic agent of any desired character, such as mercuric chlorid, may be previously mixed with the milk. The resulting article will have the consistency of ordinary printers ink or a s issitude approximating that of coagulated lood.

In practice it is found that even quantities of printers ink in the condition 1n which the latter is'found on the market, and milk will,

when mixed together, form a brilliant lasting ink, the printing being more less glossy'as i the ink forms a slight skin which immediately hardens or dries and from which no impression can be made, in other Words, there isno printing back from sheet to sheetsuch as frequently happens in rapidly running presses. I

' While the mixture of manufactured ink with milk constitutes the most simple method of utilizing the, invention, it is apparent that the milk may be combined with other inlgredientsduring the manufacture of the i and mixed in any m anner With the linseed oil, resin, pigment, and other ingredients which are employed.

Where the ink is to be stored for any considerable length of time before use it is preferred to add some antiseptic or preservative compound to the milk before the latter is mixed with the ink. o

Having thus described the invention, what is claimed is:-

1. Printing ink having .milk combined therewith and havin a spissitude approx1 matin that of coa ated blood.

2. rinting ink formed in part of skim" MARION E. McMASTER.

Witnesses E. HUME TALBERT JNo. E. PARKER. 

